Unleashed Fury by Laura R Cole (BloodRunes: Book 1)

During the time of the Massacre the Dark King reigned, declaring himself a god and securing his leadership with fear and blood-magic. Overthrown in a bloody revolt and the knowledge of the forbidden arts lost in the book burnings of the ensuing chaos, Gelendan has risen above its gruesome history. Now, hundreds of years later, its dark past forgotten, Layna is a simple maid.

But as mysterious events begin to unfold, she comes to realize that nothing is ever as simple as it seems.

She finds herself caught up in a whirlwind of deception, romance, espionage, and secret societies that soon has her life spiraling wildly out of control. Whilst fleeing the fury of her mistress - whose rage is fueled by Layna's budding relationship with the woman's former consort - and attempting to evade detection by the priests who want to control her new-found magical talent, Layna's problems are further compounded when she discovers a strange marking on her neck. A mark that is growing darker by the day. Who or what has marked her, and for what purpose she doesn't know. But it soon becomes apparent that whatever it is, it's after her...